Nitrogen Functionalized Biochar as a Renewable Adsorbent for Efficient CO<sub>2</sub> Removal
Bibliographic record
Abstract
In this study, biochar was thermally and chemically (thermo-chemically) modified and compared to the unmodified parent char in carbon dioxide adsorption. The biochars were sourced from sawmill residues and produced via fast pyrolysis in an auger reactor. The biochar was chemically functionalized using two novel methods of amine functionalization: (i) nitration, followed by reduction, and (ii) condensation of aminopropyl triethoxysilane on the surface. The obtained outcomes indicated functionalization resulted in a reduction in the pore volume and surface area of the biochar. The biochars (unmodified and chemically modified) were thermally activated via air diluted with nitrogen at moderate 560 °C to determine if the adsorption properties could be enhanced. The thermally treated functionalized chars had a lower H:C ratio, higher surface area, micropore volume, and sufficient amount of nitrogen compared to the unmodified char. The thermally treated aminopropyl triethoxysilane char had the highest adsorption capacity of 3.7 mmol/g with 0.24 wt % nitrogen. Biochars sourced from residues demonstrated high efficiency of carbon dioxide removal, comparable to some synthesized adsorbents reported in the literature.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".